What does 投入 mean?
投入 is a Japanese noun meaning “throw, investment, making (an electrical circuit)” in English. It can also be translated as “investment, launching (a product into the market), submitting (a job to a computer)” depending on context. It is written as 投入 in kanji, とうにゅう in hiragana, and tounyuu in romaji. This word is part of JLPT N1 vocabulary.
Example sentence
敵は新兵力を投入した。
The enemy flung fresh troops into the battle.